In Boston, temperatures will fall into the upper 20s on Sunday night, National Weather Service meteorologist Kim Buttrick said. Outside the city, nighttime lows are forecast in the low to middle 20s Sunday.

The start of the work week will bring highs around 35 in the city, with temperatures around 30 to the west. At night, the mercury is expected to drop to the low 20s around Boston and into the teens to the west, Buttrick said.